Sulfate Attack on Concrete - Chapter 2 pot

... CaSO 4 ·2H 2 O C S H 2 Syngenite K 2 Ca(SO 4 ) 2 ·H 2 O CK S 2 H Calcium aluminate monosulfate hydrate or monosulfate (AFm) Ca 4 Al 2 (OH) 12 ·SO 4 ·6H 2 O C 4 A S H 12 Calcium aluminate trisulfate ... + 10H = C 4 A S H 12 2C 3 A + C 6 A S 3 H 32 + 4H = 3C 4 A S H 12 C 4 ASH 12 + 2C S H 2 + 16H = C 6 A S 3 H 32 C 3 S (alite) + H → C-S-H + CH β -C...

Ngày tải lên: 08/08/2014, 10:23

... chemical attack on concrete. Source: Guide to Durable Concrete (ACI 20 1 -2 R- 92) . Reprinted with permission by the American Concrete Institute Factors which accelerate or aggravate attack Factors ... high sulfate concentrations, and it is not only the concentration of sulfate anions per se but also the type and concentration of the accompanying cations that should be tak...

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... and service-life prediction of concrete subject to sulfate attack , in J. Marchand and © 20 02 Jan Skalny, Jacques Marchand and Ivan Odler 5Consequences of sulfate attack on concrete 5.1INTRODUCTION As ... magnesium sulfate solutions. V. comparison of different slag blends”, Cement and Concrete Research 22 : 1 027 –1038; 24 : 1347– 1358; 25 : 1581–1590; 26 : 1013–1 028...

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... of Concrete, ACI Pub- lication SP-77, 7 papers, 94 pp. ACI (19 92) Guide to Durable Concrete, ACI 20 1.2R- 92, p. 10. © 20 02 Jan Skalny, Jacques Marchand and Ivan Odler Ground water conditions ... fluctua- tions, the sulfate- bearing solutions may penetrate to the exposed concrete surface where they crystallize. According to ACI Guide to Durable Con- crete (ACI 19 92) , under such...

Ngày tải lên: 08/08/2014, 11:20

... migration of sulfate- containing water into concrete. It results in concentration of the sulfate near the concrete surface and leads to an enhancement of the degradative action. The disintegration ... requirements for durable concrete, carbonation- and chloride-induced corrosion, freeze-thaw attack and chemical attack , British Cement Association. Hooton R.D. (1999) “Are sulfate...

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... 0–419 24 550 2 This edition published in the Taylor & Francis e-Library, 20 03. ISBN 0 -2 0 3-3 016 2- 5 Master e-book ISBN ISBN 0 -2 0 3-3 422 4-0 (Adobe eReader Format) (Print Edition) © 20 02 Jan Skalny, Jacques ... cements 2. 1.2Aggregates 2. 1.3 Mineral and chemical admixtures 2. 1.4Water 2. 2Hydration of Portland clinker-based cements 2. 2.1Chemistry of hydration...

Ngày tải lên: 08/08/2014, 10:23

... P.K. (20 00) Sulfate attack on concrete: separating the myth from reality”, Concrete International 22 (8): 57–61. Neville, A. (1998) “A ‘new’ look at high-Alumina cement,” Concrete International 20 (8): ... assure long-lasting durability of concrete structures in sulfate- bearing environment. Man abuses concrete by: • use of wrong or marginal concrete materials and imp...

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... ACI (19 92) ACI 20 1.2R- 92, Guide to Durable Concrete, ACI. ACI 31 8-9 9 (1999) “Building code requirements for structural concrete , American Concrete Institute, Farming Hill, MI. ASTM C15 0-9 5 (1995) ... components of the concrete mixture. Quality Control is clearly one key issue in the protection of concrete against composition-induced internal sulfate attack. It is t...

Ngày tải lên: 08/08/2014, 11:20

... effect of sulfate attack on service life of concrete. The model is based on following assumptions: 1 Sulfate ions from the environment penetrate the concrete by diffusion; 2 Sulfate ions react ... Porter, L.C. and Benton, E.J. (19 72) Concrete for long-time service in sulfate environment”, Cement and Concrete Research 2 : 79–89. Kurtis, K.E., Monteiro, P.J.M. and Ma...

Ngày tải lên: 08/08/2014, 11:20

Ngày tải lên: 08/08/2014, 11:20